Bleeding of the Normal Braking at the Brake Units

TASK 32-42-00-870-001-A
Bleeding of the Normal Braking at the Brake Units

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

WARNING: MAKE SURE THAT THE CONTROLS AGREE WITH THE POSITION OF THE ITEMS THEY OPERATE BEFORE YOU PRESSURIZE A HYDRAULIC SYSTEM. UNWANTED MOVEMENT OF HYDRAULICALLY OPERATED ITEMS CAN CAUSE SERIOUS INJURY AND/OR DAMAGE.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

1. Reason for the Job
To bleed the normal braking after all maintenance operations on the normal braking system.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	CONTAINER 10 L(2 1/2 USGAL)
No specific	AR	HOSE - BLEED
No specific	AR	HOSE - BLEED, TRANSPARENT
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 0.11 and 0.08 m.daN (9.73 and 7.08 lbf.in )
No specific	Torque wrench: range to between 0.104 and 0.096 m.daN (9.20 and 8.50 lbf.in )
No specific	Torque wrench: range to between 0.30 and 0.25 m.daN (26.55 and 22.12 lbf.in )
No specific	Torque wrench: range to between 0.58 and 0.55 m.daN (51.33 and 48.67 lbf.in )
No specific	Torque wrench: range to between 0.85 and 0.56 m.daN (75.22 and 49.56 lbf.in )
No specific	Torque wrench: range to between 0.68 and 0.565 m.daN (60.18 and 50.00 lbf.in )
No specific	Torque wrench: range to between 0.7425 and 0.6075 m.daN (65.71 and 53.76 lbf.in )
No specific	Torque wrench: range to between 0.72 and 0.68 m.daN (63.72 and 60.18 lbf.in )
No specific	Torque wrench: range to between 4 and 3.85 m.daN (29.50 and 28.39 lbf.ft )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.02ABA1)	Phosphate Ester Hydraulic Fluid-General Power - -
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.14QFB1)	Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
3	PACKING	AIPC 32-42-36-01-080
6	PACKING	AIPC 32-42-36-01-080

D. Referenced Information

REFERENCE	DESIGNATION
TASK 12-12-29-611-001-A	Fill the Hydraulic Fluid Reservoir with a Hand Pump
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
TASK 29-23-00-863-001-A	Pressurize the Green Hydraulic System from the Yellow Hydraulic System through the PTU with the Electric Pump
TASK 29-23-00-864-001-A	Depressurize the Green and Yellow Hydraulic Systems after Operation of the PTU
TASK 32-42-00-710-001-A	Operational Check of the Normal Braking System
TASK 32-42-36-860-001-A	Reactivation of the Normal-Brake Safety-Valve
TASK 32-42-36-860-001-A-01	Reactivation of the Normal-Brake Safety-Valve
Normal Braking System - Bleeding
Normal-Brake Safety Valve - Bleeding ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 32-42-00-860-054-A

A. Aircraft Maintenance Configuration
(1) On the right-center instrument panel (400VU), make sure that the L/G normal control lever is set to DOWN.
(2) On the rudder-trim/parking-brake panel (110VU), make sure that the PARKING BRK control switch is set to OFF.
(3) On the landing-gear control and indicating panel (402VU), make sure that the A/SKID & NOSE WHEEL switch is set to ON.
(4) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(5) Pressurize the Green hydraulic system from the Yellow hydraulic system through the PTU with the electric pump (Ref. AMM TASK 29-23-00-863-001).
(6) If you bleed after rupture of the hydraulic line, you must do the reactivation of the Normal Brake Safety Valve (Ref. AMM TASK 32-42-36-860-001).

Subtask 32-42-00-941-054-A

B. Safety Precaution
(1) Put the WARNING NOTICE(S) in position to tell persons not to operate the landing gear.

Subtask 32-42-00-865-054-A

C. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	L/G/Y BRK/PRESS/IND	61GG	C10
** ON A/C NOT FOR ALL
49VU	ABCU &/Y BRK/PRESS IND	61GG	C10
** ON A/C ALL
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/SPLY	4GG	M36
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/CTL	3GG	M35
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/CTL	1GG	M34
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/IND AND/SPLY	2GG	M33

4. Procedure
Subtask 32-42-00-870-052-A

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

WARNING: DO NOT GET THE FLUID ON YOUR SKIN OR IN YOUR EYES. IF YOU DO:

FLUSH IT AWAY WITH CLEAN WATER
GET MEDICAL AID.

A. Bleed the Normal Braking System

NOTE: Bleed port for the normal brake system (Green hydraulic system) is the aft bleed port.

(1) Remove the bleed screw plug from the related brake unit.
(2) Connect a HOSE - BLEED, TRANSPARENT and put one end in a container that contains Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) .
(3) Moderately push down the brake pedal related to the brake that you bleed.
(4) Release the bleed screw half a turn more, to let the fluid flow. Do this until there are no air bubbles in the fluid that you can easily see.

NOTE: Airbus recommend that you bleed a minimum of 0.5 l (0.1321 USgal), but you can bleed more than this amount.

NOTE: It is possible that the fluid you bleed will have froth and also come out as an intermittent flow that alternates with large air bubbles.

(5) Continue to bleed the fluid until the flow is constant.

NOTE: Fluid that contains very small bubbles of air can cause the fluid to be white. When this fluid becomes stable in the container, it shows its normal color.

NOTE: The safety valve can close if the flow rate is more than 6 l (1.5850 USgal) per minute during the bleeding operation.

(6) Keep the pressure on the brake and TORQUE the bleed screw:

to between 0.7425 and 0.6075 m.daN (65.71 and 53.76 lbf.in ) for MESSIER-BUGATTI (SAFRAN) brakes
to between 0.72 and 0.68 m.daN (63.72 and 60.18 lbf.in ) for GOODRICH brakes
to between 0.85 and 0.56 m.daN (75.22 and 49.56 lbf.in ) for MESSIER-GOODRICH brakes
to between 0.68 and 0.565 m.daN (60.18 and 50.00 lbf.in ) for MABS brakes.

(7) Release the brake pedal.
(8) If it is necessary, do the operations again until all the air is removed from the braking system.
(9) Disconnect the HOSE - BLEED, TRANSPARENT. Remove all signs of the fluid from the bleed screw.
(10) Install the bleed screw plug.
(11) TORQUE the bleed screw plug:

to between 0.30 and 0.25 m.daN (26.55 and 22.12 lbf.in ) for MESSIER-BUGATTI (SAFRAN) brakes
to between 0.104 and 0.096 m.daN (9.20 and 8.50 lbf.in ) for GOODRICH brakes
to between 0.11 and 0.08 m.daN (9.73 and 7.08 lbf.in ) for MESSIER-GOODRICH brakes
to between 0.58 and 0.55 m.daN (51.33 and 48.67 lbf.in ) for MABS brakes.

Subtask 32-42-00-870-053-A ** ON A/C NOT FOR ALL

B. Bleeding of the Normal-Brake Safety Valve

Normal-Brake Safety Valve - Bleeding ** ON A/C NOT FOR ALL

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

CAUTION: MAKE SURE THAT THE FLUID DOES NOT STAY ON THE AIRCRAFT STRUCTURE. IF THE FLUID GETS ON THE AIRCRAFT STRUCTURE, WASH IT OFF IMMEDIATELY WITH SOAP AND WATER.

CAUTION: DO NOT PUSH THE BRAKEPEDALS WHILE YOU BLEED THE SAFETY VALVE. MOVEMENT OF THE PEDALS WILL INCREASE THE PRESSURE IN THE SAFETY VALVE AND WILL CAUSE DAMAGE TO THE SAFETY VALVE.

(1) Bleeding of normal-brake safety-valve P/N C24757000
(a) Fully push, then release the two brake pedals. Do this ten times.
(b) Depressurize the Green and Yellow hydraulic systems.
(Ref. AMM TASK 29-23-00-864-001).
(c) Make sure that the PARKING BRK control switch is set to OFF.

CAUTION: DO NOT PRESSURIZE THE HYDRAULIC RESERVOIRS TO MORE THAN 1 BAR (14.5 PSI). HIGHER PRESSURE WILL CAUSE DAMAGE TO THE SAFETY VALVE.

(d) Decrease the pressure of the Green hydraulic reservoir to between 0.5 bar (7.25 psi) and 1 bar (14.50 psi) (Ref. AMM TASK 29-14-00-614-001).
(e) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position below the applicable zone 731 (741).
(f) Put a CONTAINER 10 L(2 1/2 USGAL) in position below the related normal-brake safety valve.
(g) Remove the dust cap (1) from the bleed screw (2).

(h) Cut, remove and discard the lockwire from the bleed screw (2).
(i) Slowly loosen the bleed screw (2) to release the hydraulic pressure.
(j) When the fluid flow stops, do a check of the packing (3).
1 If the packing (3) is damaged, do the steps that follow:
a Remove the bleed screw (2).
b Remove and discard the packing (3) from the bleed screw (2).
c Install a new AIPC 32-42-36-01-080 PACKING (3) on the bleed screw (2).
d Loosely install the bleed screw (2).
(k) Tighten the bleed screw (2) until it touches the normal-brake safety valve (4), then tighten it to one-eighth of a turn.
(l) Remove the HOSE - BLEED and the CONTAINER 10 L(2 1/2 USGAL).
(m) Use a clean Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) to:
1 Remove the unwanted hydraulic fluid from the normal-brake safety valve and the adjacent area.

(n) Safety the bleed screw (2) with lockwire 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(o) Install the dust cap (1) and tighten it.

(2) Bleeding of normal-brake safety valve P/N C25243002-2
(a) Fully push then release the two brake pedals. Do this ten times.
(b) Depressurize the Green and Yellow hydraulic systems.
(Ref. AMM TASK 29-23-00-864-001).
(c) Make sure that the PARKING BRK control switch is set to OFF.

CAUTION: DO NOT PRESSURIZE THE HYDRAULIC RESERVOIRS TO MORE THAN 1 BAR (14.5 PSI). HIGHER PRESSURE WILL CAUSE DAMAGE TO THE SAFETY VALVE.

(g) Cut, remove and discard the lockwire from the plug (5).
(h) Slowly loosen the plug (5) to release the hydraulic pressure.
1 Do not loosen the plug (5) more than 2.5 turns.
(i) When the fluid flow stops, do a check of the packing (6).
1 If the packing (6) is damaged, do the steps that follow:
a Remove the plug (5).
b Remove and discard the packing (6) from the plug (5).
c Install a new AIPC 32-42-36-01-080 PACKING (6) on the plug (5).
d Loosely install the plug (5).
(j) TORQUE the plug (5) to between 4 and 3.85 m.daN (29.50 and 28.39 lbf.ft )

.
(k) Use a clean Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) to:
1 Remove unwanted hydraulic fluid from the normal-brake safety valve and the adjacent area.

(l) Safety the plug (5) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.

Subtask 32-42-00-210-057-A

C. Fluid Level Check
(1) Make sure that the level of the fluid in the reservoir of the Green hydraulic system is correct. If necessary, fill the hydraulic fluid reservoir (Ref. AMM TASK 12-12-29-611-001).

Subtask 32-42-00-710-056-A

D. Test
(1) Do the operational test of the normal braking (Ref. AMM TASK 32-42-00-710-001).
(Only obey para. 4 A).

Do a check of the operation of the pedals for the related brake unit.

NOTE: The safety valve can close if the flow rate is more than 6 l (1.5850 USgal) per minute during the bleeding operation. If there is no pressure at the brake during the test, you must re-activate the related safety valve (Ref. AMM TASK 32-42-36-860-001).

NOTE: It is necessary to make sure that there are no leaks on the bleed screw before and after the test.

Subtask 32-42-00-860-053-A

E. Aircraft Maintenance Configuration
(1) Depressurize the Green and Yellow hydraulic system (Ref. AMM TASK 29-23-00-864-001).
(2) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

5. Close-up
Subtask 32-42-00-942-053-A

A. Removal of Equipment
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the WARNING NOTICE(S).
(3) Remove the fluid container.
(4) Remove the access platform(s).
(5) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.01 04:45:31 UTC